page_title: St. Margaret's Bay Hydroelectric System
section_title: Dams, Wing Dams, Spillways, and Canals
hierarchical_section_title: St. Margaret's Bay Hydroelectric System / Technical characteristics / Dams, Wing Dams, Spillways, and Canals
caption_attribution_description: The Generator is the business end of the hydro-electric system and is rotated by the turbine below, which produces the electricity to be sent to the main grid to be used by the consumer. The Generators were made by General Electric Co limited from Peterborough, Toronto, Ontario, Canada. 2900 KVA 13,200 Volts 127 Amps
context_page_description: The St. Margaret's Bay Hydroelectric System consists of three hydroelectric power plants and the related lake, dam, and river systems driving them. The system is situated within both Lunenburg County and the Halifax Regional Municipality, beginning approximately 2.5 km east of the Head of Saint Margarets Bay and approximately 10 km southwest of Hammonds Plains. The system is part of the East Indian River watershed and drains 271 square kilometres, with water storage provided in Lunenburg County by Mill Lake, Coon Pond, Sandy Lake, Wrights Lake, Big Indian Lake, Five Mile Lake and, at times, an overflow from Pockwock Lake in the Halifax Regional Municipality. The system is owned and operated by Nova Scotia Power Inc.
  System assets associated with the St.
context_section_description: There are 19 dams and wing dams of various heights, lengths and construction types holding back the lakes and reservoirs that make up the St. Margaret's Bay Hydroelectric System:
  Water for the system comes from Five Mile Lake, Big Indian Lake, Sandy Lake, Wrights Lake, Coon Pond, Mill Lake and, at times, overflow from Pockwock Lake. The two principal storage areas for the Sandy Lake Development are Five Mile Lake and Big Indian Lake.
  On the Eastern side of the system, drainage into Wright’s Lake and Coon Pond, in addition to surplus water from Pockwock Lake (owned by Halifax Regional Municipality), supplies the Mill Lake Plant. The new Coon Pond Dam has water continually flowing out from a maintenance chute to ensure water is always feeding a stream leading to St. Margaret’s Bay to maintain fish habitat in the stream.
  Output water from the Sandy Lake and Mill Lake plants then flow into the Mill Lake Head Pond to supply the Tidewater Plant which outputs at sea level into St. Margaret's Bay.
  The total elevation from the highest reservoir to sea level is 134.2 m (440 ft). The St. Margaret's Bay Hydroelectric System has an annual output of 30 Gigawatt hours of electricity from two .6 MW generators at Mill Lake and two 2.9 MW generators at the Tidewater plant.
caption: The Generators were made by General Electric Co limited from Peterborough, Toronto, Ontario, Canada.
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